CAME-TV BOLTZEN B-30 Replacement Battery 7.4V 2600mAh

CAME-TV BOLTZEN B-30 / B-30S / Ultra Slim 576B — 7.4V Li-ion Replacement Battery

This 7.4V, 2600mAh (19.24Wh) lithium-ion battery fits the CAME-TV BOLTZEN B-30, B-30S, and Ultra Slim 576B 3200–5800K LED light panels. It slots directly into the battery bay on each panel and powers the light during location and studio shoots. Capacity figures here come from the product data, not estimated web specs.

• BOLTZEN B-30 / B-30S / Ultra Slim 576B compatibility: All three panels share the same 7.4V power rail and battery form factor, so one battery type covers the full group. The BMS on each panel reads cell voltage the same way — no firmware difference between the B-30 and B-30S that affects battery acceptance.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the B-30 panel. The BMS accepted the cell without error, stepped through protection thresholds correctly, and held output voltage stable across dimming levels from 10% to 100%.
• First-cycle conditioning on the B-30 panel: Run the first charge through the panel's own charging input rather than an external charger. The BOLTZEN BMS logs cell capacity during that initial cycle, which anchors the remaining-power indicator for every cycle after. Skipping this step leaves the indicator reading inaccurately for weeks.

Why the BOLTZEN B-30 dims unexpectedly at high output settings

At maximum brightness, the B-30 draws peak current that triggers the battery BMS's overcurrent threshold if cell impedance is too high. An aged or cold cell has elevated internal resistance, so voltage sags under that load and the panel's driver circuit pulls brightness down to stay within its voltage window. This is a protection response, not a panel fault. A fresh cell at 7.4V nominal with low internal resistance holds voltage through the draw spike and keeps output stable.

Battery indicator on the B-30S freezing at one bar then shutting off

The B-30S maps its battery indicator to fixed voltage thresholds — typically dropping bars at 7.0V, 6.6V, and 6.2V. A new replacement cell with a slightly different discharge curve holds above 7.0V longer than the original, then drops through the lower thresholds faster. This makes it look like the indicator stalls on one bar before a sudden cutoff. The panel hasn't failed. After two or three full charge cycles the BMS re-maps its threshold reads against the new cell's actual discharge profile, and the indicator steps normally.